<!DOCTYPE html>
<html>

	<head>
		<script type="text/javascript">
			function loadXMLDoc() {
				var xmlhttp;
				if(window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
					xmlhttp = new XMLHttpRequest();
				} else { // code for IE6, IE5
					xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				}
				xmlhttp.onreadystatechange = function() {
					if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
						document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
					}
				}
				xmlhttp.open("GET", "/ajax/demo_get.asp", true);//异步请求
				xmlhttp.send();
			}
		</script>
	</head>

	<body>

		<h2>AJAX</h2>
		<button type="button" onclick="loadXMLDoc()">请求数据</button>
		<div id="myDiv"></div>

	</body>

</html>